Auwers Synthesis

K. v. Auwers et al., Ber. 41, 4233 (1908); 48, 85 (1915); 49, 809 (1916); K. v. Auwers, P. Pohl, Ann. 405, 243 (1914).

Expansion of coumarones to flavonols by treatment of 2-bromo-2-(α-bromobenzyl)coumarones with alcoholic alkali:



T. H. Minton, H. Stephen, J. Chem. Soc. 121, 1598 (1922); J. Kalff, R. Robinson, ibid. 127, 1968 (1925); B. H. Ingham et al., ibid. 1931, 895; B. G. Acharya et al., ibid. 1940, 817; S. Wawzonek, Heterocyclic Compounds 2, 245 (1951). Cf. Algar-Flynn-Oyamada Reaction.